کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1768677 | 1020234 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The GPS measured SITEC caused by the very intense solar flare on July 14, 2000
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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چکیده انگلیسی
This work studies the sudden increases in total electron content of the ionosphere caused by the very intense solar flare on July 14, 2000. Total electron content (TEC) data observed from a Global Positioning System (GPS) network are used to calculate the flare-induced TEC increment, δTECf, and variation rate, dTECf/dt. It is found that both dTECf/dt and δTECf are closely related with the solar zenith angles. To explain the observation results, we derived a simple relationship between the partial derivative of the flare-induced TEC, âTECf/ât, which is a good approximation for dTECf/dt, and the solar zenith angle Ï, as well as the effective flare radiation flux If, according to the well-known Chapman theory of ionization. The derived formula predicted that âTECf/ât is proportional to If and inverse proportional to Chapman function ch(Ï). This theoretical prediction not only explains the correlation of dTECf/dt and δTECf with Ï as shown in our TEC observation, but also gives a way to deduce If from TEC observation of GPS network. Thus, the present work shows that GPS observation is a powerful tool in the observation and investigation of solar flare effects on the ionosphere, i.e., the sudden ionospheric disturbances, which is a significant phenomenon of space weather.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 36, Issue 12, 2005, Pages 2465-2469
Journal: Advances in Space Research - Volume 36, Issue 12, 2005, Pages 2465-2469
نویسندگان
Weixing Wan, Libo Liu, Hong Yuan, Baiqi Ning, Shunrong Zhang,